Drilling apparatus



Dec. 26, 1944.

nnnnnn w. w. PAGET DRILLING APPARATUS Filed Aug. l. 1941 2 Sheets-Sheetl Dec. 26, l944 A WW PAGET 2,365,835

DRILLING APPARATUS Filed Aug. l, 1941 2 Sheets-Sheet 2 Patented Dee. 26,1944 Massachusetts Sullivan `Machinery Company, a corporation ofApplieationagnsti,1941,seraiNe.4o5,os6 l l Claims.` `This inventionrelates kto drilling apparatus,

and more particularly tc` chuck mechanisms `for drills of the `rotarytype.`

An object of this` invention is to provide `a improved chuck mechanismfor a drilling apparatus. Another object is to provide an improved.flexible chuck for a drill of the rotary type. Still i another objectis to provide an improved chuck comprising pieces bonded together by aflexible material whereby a drill rod, supported within the chuck, ispermitted to move angularly relative to the drill actuating means but isnormally maintained in a given line. Still another object is toprovidean improvedflexiblechuck for a drilling apparatus of the rotarytype, the chuck comprising pieces bonded together by a flexible materialin such a mannerthat thereis produced within the material, on angularmovement of a drill rod relative to the drilling apparatus, stressesV inshear and 'compression `Still another object is 'to provide an improvedflexible chuck comprising `pieces bonded together by aflexible materialldisposed between and secured to curved surfaces. invention will,however, hereinafter more fully appear. r

In theaccompanying drawings there is shown for purposesof illustrationone form which the invention may assume in practice.1

In these drawings:

Fig. 1 is a side elevational view of a drilling apparatus in which anillustrative embodiment of the invention. is incorporated. Y

Fig. 2 is an` enlarged view of the drill rotating motor and the improvedchuck with parts shown in section. r e

Fig. 3 is an enlarged fragmentary sectional view showing details of thechuck and associated parts of the drilling` apparatus.

Fig. 4 is a view showingthe rear portion` of the -drill rod in sideelevation.

Fig. 5 is a transverse sectional view taken on `une plane of the line 55 Fig. 3.

In the illustrative embodiment of the invention there is shown adrillingmechanism, generally designated l, comprising bit rotation meansgenerauy designated z, drin bit feeding meets 'gen'. erallydesignated 3yand drill guiding and supporting means generally designatedl.

The supporting and guiding means 4 comprises atrunnion member 5 having aswivel plate 6 adapted to be clampedn the saddle mounting of a suitablesupport. The trunnion member 7 lslidingly supports afeed cylinder 'l ofa hydraulic Other objects and advantages of thel feeding means, thecylinder containing a usual reciprocable feed piston having its pistonrod projecting forwardly and supporting atv its forward end a controlhead Associated with the hydraulic feeding means is a manual feedingmeans including a feed screw 9 operated by a hand crank l0, for manuallyfeeding the feed cylinder Arelative to the trunnionmernber. The rotationmeans 2 includes a rotary motor l2 supported by the controlhead 8 andhaving secured to its power shaft animproved chuck Hl which receives theshank. of a hollow drill rod l5 by which a usual drillbit l5 is carried.It will be noted that this apparatus is adapted to effect rectilinearfeed of the drill bit and to rotate it on its axis.

Referring to the rotary motor I2 which is shown herein as being of theelectric type, it will be noted that front and .rear heads l1 and i8 areheld in assembled relation with respect'to a motor the rear end o f therotor shaft is a bearing retaining member` 25, and the inner raceof therear `bearing 24 is held between a member 26 engag-i -32 to providea-liquid` seal.

casing I9., by usual tie bolts 25. The motor has a usual` eld 22, and arotor mounted on a shaft 23 which is supported in bearings 24, 24arranged in theA motor. heads. Threadedly connected to ing a shoulder onthe shaft and the member 25,

`in vthe manner shown. Theinner race of the front bearing 24 is held inasimilar manner between amember 28 threaded on the forward portion. ofthe shaft and a member29 rlx'ed to the shaft. Arranged on the rear endof the rotor shaft is a packing. ring 3l cooperating with an annular;flange on a member 32v secured to the rear motor head I8 for providing aliquid seal.

The vmember 25 also has a sleevelike portion 33 surrounding a cylindricportion of the member These seals restrict in a very effective mannerthe flow of liquid from a space `35 to the bearings 24.

Extending axially through the rotor shaft is a 4loore 3B, and arrangedin this bore is a fluid conducting tube 3l, the latter beingv somewhat.smaller than the bore to provide a `clearance between -the tube and theshaft. The tube 31 is lthreaded at its rear end into a 4recess 33 formed-in .a member 39 secured to the control head 8, .and suitable passages,not shown, are provided for connecting the recess to asuitable source ofcleansing fluid,.herein a source of liquid under Any ,liquid leakingaround the rear and a passage 4I connects the space 35 to a vent 45 is abushing 41 having a rearwardly extending sleeve portion 48 fittingloosely over the sleeve portion 46. Threaded on theforward portion ofthe rotor shaft is a collar 50, and the chuck I 4 is threaded on theshaft at I with its rear end abutting the collar. Threaded at v52 withinthe chuck I4 is a member 53 which rotates with the chuck, and extendinglongitudinally through this member is a bore. 54 providing a smallclearance around the bushing 41. Arranged in the bore 54 are washers 56and 51 having disposed .therebetween suitable packing 58. Threaded inthe forward end of the borey 54. is an adjusting plug 66 provided with ascrew driver slot 6I, and this plug engages the forward washer 56. Uponadjustment of the plug 60, the front washer may be moved rearwardly tocompress the packing 58 between the washers 55 5I into tight sealingengagement withv theexterior of the tube, thereby to reduce leakagerearwardly along. the tube. Any liquid escaping .past the packing passesthrough the spacev surrounding the bushing Y41 and. through a spacev 62between the member 53 and the forward end of the rotor shaft to ventports 63. The bushings 4-5 and 41 maintain the tube 31 central of the.bore 36 and prevent anyv compression of the packing 58 from forcing thetube laterally. 'Ihe rearwardly extending sleeve portion 48 on thebushing 41 cooperates with the sleeve portion 48 on the bushing 4.5 toprovide a seal which. prevents liquid passing to the vent port 63 fromgaining admission. to the bore in the rotor shaftv by passing along thetube.

Referring to the improved'chuck I4, it will be noted that it comprises'a main body portion 65 which is made up of two. pieces 66 and 61 bondedtogether by a flexible material 68 such asr rubber. The pieces 66 and61' are provided with curved surfaces 69 and Tuto which the material 68is bonded or otherwise secured.. These surfaces' are shown here asforming portions of spheres, but it will be understood that surfaces ofother curvatures may be satisfactory. -By reason of the ilexiblematerial, relative movement between the pieces 66 and 51 ismadepossible, and, due to the curved surfaces, the stresses produced in theflexible material, when the piece' 61 is movedl relative to the piece 65on angular movement ofthe drill rod I5, are in shear and compression,thereby reducing the tendency of pulling the-pieces away from thebonding material. Projecting inwardly through radially extending portsin the forward end of the chuck body' are pins 12' which fit withinslots T3 on the shank" of the drill; rod for holding the latter inpositionY within the chuck. Threaded on the chuck body at 1'5 is acollar 16 which extends *overV theouter endsof the pins 12 and holdsthem in place. Formed on the shank of the drill rod! is an annularflange 18 having a beveled, surface 19 which isv held'. firmly inengage'- rnent with a beveledsurface 80 on the forward end of the collar16 when the drill rod is supportedv within the. chuck.. Between thechuck body 65 and the drill rod, at the rear end of the latter, is anannular space 82, and between the inner periphery of the drill rod andthe member 53 there is another annular space 83, the spaces 82 and 83providing adequate room for angular movement of the drill rod permittedby the flexible chuck.'

While there is in this application specifically described one form whichthe invention may assume in practice, it will be understoodfthat thisform of the same is shown for purposes of illustration and that theinvention may be modified and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

l. In a drilling apparatus, in combination, a motor for rotating a drillrod, and a flexible chuck for supporting the shank of said drill rod indriving relation with said motor for permitting limited angular movementbetween the axes thereof, said chuck including two pieces, one providedwith a convex curved surface and the other provided with a concavecurved surface of sub stantially the same curvature as the rst, saidconvex curved surface facing toward said concave curved surface andspaced therefrom equal distances at all points on ,lines normal to thesurfaces, means including a flexible material arranged between saidcurved surfaces for bonding said pieces together, means for detachablysecuring one of said pieces to the drive shaft of said motor, and meansfor detachably' securing the shank of said drill rod to the other ofsaid pieces.

2. In a drilling apparatus, in combination, a motor for rotating a,drill rod, and a flexible chuck for supporting the shank of said drillrod in driving relation with said motor while permitting limitedrelative angular movement of the axes' thereof, said chuck includingtwol coaxial annular pieces having their adjacent surfaces conforming toportions of the surfaces of spheres having a common center, meansincluding a layer of flexible material arranged between the adjacentsurfaces of said pieces for bonding the latter together, means forsecuring one of said pieces to the drive shaft of said motor, and meansfor securing the shank of saidr drill rod to the other of said pieces.

3. In a drill chuck mechanism, the combination comprising a rotatabledriving member having a socket adapted toreceive the shank of a drill tobe driven, a driven member to which the dri-ll is connected for rotationtherewith, and a flexible driving connection between said driving anddriven members, said flexible driving connection being so constructed asto permit limited angular movement of the axis of said driven memberrelative' to the axis of said drivingmember while maintaining a drivingconnection therebetween, the shank of the drill extending into saidsocket and said socket being so formed as to permit limited angularmovement of the drill shank tion comprising a rotatable driving member,a

driven member to which a drill is connected for rotation therewith, saidmembers cooperating to provide a socket adapted to receive the shank ofthe drill, and a exible driving connection between said driving anddriven members, said ilexible connection being so constructed as toApermit limited angular movement of the axis of said driven memberrelative to the axis of said driving member while the drive between saidmembers is maintained, the shank of the drill extending into said socketand the socket being so formed as to permit limited angular movement ofthe drill shank therein relative to said drivingmember upon such angularmovement of the axes of saidmembers.

WIN W. PAGE-T.

